Long-distance pressure-recorder.



J. W. BARD. LONG DISTANCE PRESSURE RECORDER.

APPLICATION FILED NOV. 8, 1911.

Patented June 11, 1912.

2 SHEETS-SHEET l.

J. W. BARD. LONG DISTANCE PRESSURE RECORDER. APPLIoATIoN FILED Nov. 8,1911.

I 1,028,851. Patented June 11, 1912. 2 SHEETS-SHEET 2.

o all whom it may cof/wem:

Be it known that I, JACOB W. BARD, a citizen of the United States,residing at Peoria, in the county of Peoria and State of Illinois, haveinvented certain new and useful Improvementsl in Long-DistancePressure-Recorders, of which the following is a specification, referencebeing had to the accompanying drawings;

My invention relates to improvements in devices for recording pressureof vapor or liquids at a ypoint distant from the original indicatingdevice.

As is well-known, there are various instruments used for indicating thepressure of steam, compressed air, or other vapor or liquid, in whichthe indicating hand, moved by suitable mechanism which is operated bythe pressure, indicates the pressure, or, by tracing a line on a chartoperated by clock mechanism, gives a continuous record of pressure.Such, for instance, is an instrument of the so-called Bristol type,wherein a spiral or coiled metal tube tends to straighten out under theincreasing pressure of the vapor or liquid which is conducted to it and,by this straightening out, moves the index hand or recording pen toindicate the pressure, or, in connection with a moving chart traversedby a pen which traces a line on the chart, gives a continuous record ofthe pressure.

Many attempts have been made to provide mechanism by which the index ofthe pressure or a continuous record of the pressure on the gage may bemade at a point distant from the gage itself, but many difficulties havearisen in such instruments.

It is the object of my invention to provide a simple mechanism, which,by transmitting the indication or record electrically, may enable arecord corresponding to the movement of the gage at the point at whichpressure is f applied to be made at any desired point remote from theoriginal source.

In the drawings-,#Figure l is a diagrammatic view, illustrating theessential features view, and Fig. 2 is a modification, being adiagrammatic illustration, partly 1n isome- Specification of LettersPatent.

of my invention, partially in an isometric' UNITED STATES ,PATENTOFFICE@ ACOB W. BARD, OF PEORIA, ILLINOIS, ASSIG-NOR TO SANGABIOELECTRIC COMPANY,

OF SPRINGFIELD, ILLINOIS, A CORPORATION 0F ILLINOIS.

LONG-DISTANCE PRESSURE-RECORDER.

Patentedauae :ansia Application filed lNovember 8, 1911. Serial No.659,253.

don type, showing, however, only a spiral tube with the index armattached, as the rest of the parts are well known and understood andform of themselves no part of my invention. The instrument may be of anywellknown type, and therefore to illustrate such an instrument in allits parts would unnecessarily encumber the drawings.

4 indicates an index hand, which, in case a moving chart is used, as isshown in the embodiment of my drawings, is supplied with an ink-pen 5which is adapted to trace a line upon a roll of paper 6, shown in dottedlines in the figure and operated in any Wellknown manner. By thecontraction or expansion of the spiral tube 3 under varying degrees ofpressure, the index hand 4E is swung to one side or the other in thewellknown and usual manner.

7 indicates a suitable shaft mounted in bearings 8 so as to rotate orrock therein. The shaft, together with the other parts hereinafterdescribed, are, of course, mounted in a suitable casing or support ofany well-known and preferred type (not shown), as to do so'would onlyencumber the I drawings with unnecessary illustration, and which, ofitself, of course, forms no part of my invention.

9 indicates a rod, which is fixed in the shaft 7 and is connected at itsother end with the index rod LLwhereby, as the rod 4 is swung to and froby the action of the tube 3, the shaft7 is rocked in its bearings. 10-11indicate solenoids, which, byA means of arms 1213, are carried on theshaft or spindle 7 so as to be swung to and fro, with the rocking of theshaft.

1li-15 indicate cores, which are preferably provided with three arms, asshown in the drawings, although they may be of other approved form. Thecentral arms 14a- 15a are designed to enter within the solenoids 10 and11, respectively, so that as the sole noids are swung to and fro thesaid arms will penetrate a greater or lesser distance into thesolenoids.

16' indicates a shaft or spindle, which is mounted in bearings 17, alsosupported, of course, like the other parts, upon a suitable support orcasing.

18-19 indicate solenoids, which by arms 20-21 are suspended from thespindle 16 so that when the solenoids 18-19 are moved upon their coreshereinafter described the spindle-16 is rocked in one direction or theother.

22 indicates an arm fixed at one end on the spindle 16 and connected 'atthe other end with a pointer 23 which is pivoted in a suitable bearings,as 24. f 25-26 indicate cores having, respectively, arms 25a-26a whichenter, respectively, the

. solenoids 18 and 19. The arm 23, when the instrument is used as arecording instrument, is provided with a pen 27 of any well-- known typeadapted to bear upon and trace a l1ne upon a suitable roll of paper, as28, which is moved in any wellown manner. It is obvious that'when thesolenoids 18-19 are moved in and out uponl the projecting arms e-26a ofthe cores 25-26 in the described the shaft 16 will be rocked and therebythe index arm 23 swung in one direction or the other.

29-30 indicate the wires coming from any of alternating currentsupsuitable source ply. The wire 29 is connected at its end withwires-31`32 in parallel. The wire 31 is connected with the solenoid 11and leads away from the solenoid 11 to and from solenoid 18, and thenceback to circuit wire 30,

connecting the solenoids 11 and 18 in series. The wire 32 is connectedwith the coil of solenoid 10 and leads from thence to the coil ofsolenoid 1-9 and thence back to circuitwire 30, connecting the solenoids10 and 19 in series. Thus the solenoids 11 and 18 areil connected inparallel `with solenoids 10 an 19.

The parts are so arranged that when the 'index arm 4 stands at zero onthe chart or on a suitable scale, the solenoids 10 and 11 willI bepenetrated approximately evenly by arms 14a-15, and the position of thesolenoids, therefore, upon the coils will be balanced and approximatelythe same amount of current will pass through solenoids 1() and 11. Thesolenoids 19 and 18 are so connected with arm 23 that when they are also1n a balanced position the arm 23 will stand at zero. It will,therefore, follow that until one solenoid or the other is moved 'uponits core the passage of the alternating current through -the solenoidswill not have any effect upon either arm and both will stand at zero;When, now, the pressure gage is submitted to pressure the arm 4 will beswung to the right, correspondingly rocking the shaft 7 and moving thesolenoid 10 more deeply upon'the arm 14a of the core 14. This will cause'a greater impedance to the current passing through the solenoid 10, andconsequently, through its connection, a greater impedance to the currentpassing through solenoid 19, causing a lesser amount of current to iow`through the circuit 32. The solenoid 11 will be moved farther out uponthe arm 15a of the core 15, causing a lesser impedance and consequentlya greater cates a-bent arm, wh

upon the arm-25a, causing the index arm 2 to be swung also to the right,correspondin with the movement of the arm 4. As th current, of course,seeks a balance t-hroug the circuits, the amount of movement of the arm4 will be directly communicated to the arm 27 and will cause it to moveto a corresponding portion of the scale or to a corresponding portion ofthe moving chart,- if such chart is use ,-as that to which the arm andindex 4 moves, and in case the pens 5 and 27 are used, will produce uponthe chart 28 a record precisely equal to the record made by pen 5 uponchart 6. It will be obvious -that the two portions of my device may be along distance apart and that thereby the record gage at the point atwhich the pressure is applied may be transmitted and duplicated at apoint at practically any desired distance therefrom.

Referring to Fig. 2, the distant part of my apparatus is precisely likethat shown in Fig. 1 and is correspondingly numbered. The modiicationconsists of t-he parts connected with t-he pressure gage at the place atwhich the pressure is applied. It will not be, therefore, necessary forme to redescribe the part of my apparatus directly connected wit-h andoperated by this part, 33 indicates gage of any approved type andcarrying an index arm 34 which may be provided wit-h a pen 35 to workupon a roll of paper 36 operated in any well-known way. 37 indicates alaminated core, which is energized by windings 38 connected by wires39-40 y with any suitable source of alternating current. 41 indicates arotor mounted upon a shaft 42 supported, of course, in suitable bearingso-f any type (not shown). 43 indiichv is mounted at one end in the shaft42 and is connected at the other end with the index pointer 34, whereby,when the index pointer is swung by the motion of the pressure gage 33,the shaft 42, 'and consequently the rotor 41, is correspondiniglypartially Vrotated in one direct-ion or the ot er ings upon the rotor41. These windings are in quadrature and for purposes of properoperation should be distributed around the entire periphery of the rotor41, but they are shown only are well-understood in the art. 46 indicatesa wire connect-ion between the windings 444-45 ofthe rotor 41. 47indicates a circuit wire, which leads from the winding 44 to and awayfrom solenoid 18. 48 indicates a circuit wire, which leads from thewinding 45 on rotor 41 to and away from solenoid 19. At a suitablepoint, as 49, it is of the pressure upon the' the pressure gage. In thecoil of a pressureupon its shaft. 44`45 indicate winddiagrammatically asas they connected with the wire 50, and the united circuits areconnected by the circuit wire ""50 with the wire 46 which connects thewindings ot the rotor 41. lt will be obvious that bythe magnetic fluxbetween the poles ot the core 37 an alternating electric current is setup through one or the other, or both, of the windings 44-45 upon therotor 41, depending upon the position of the rotor. ln the positionshown, in which the pens 34 and 23 are moved to the right, the winding44 is at right angles with the magnetic flux, and consequently thealternating current is generated only through the winding 44. The otherwinding 45 being parallel with the lines of the magnetic tiux, nocurrent will be set up in it.

lNhen the pens are in normal positionthat is, at Zero point-the rotorwill be in such a position that each of the two coils will be equallyaffected by the magnetic flux between the poles of the core, and thcsame current will flow through both circuits and through both solenoids1S-19, and they will remain in balanced position upon their respectivecores. When, however, the pen is swung to the right so as to bring onecoil into a more effective and the other into a lesser effectiveposition, the circuits through the solenoids 18-19 will be equallyadected. For instance, it the rotor is turned contracloclrwiseforty-tive degrees from the position shown in Fig. 1 so that the indexarm is at Zero position, both coils will be equally affected by themagnetic flux between the poles and an equal current will be caused toY.flow through the circuits from said coils and through the solenoids18#19. l, now, the pressure is brought to bear upon the pressure gage 33and the index arm swung to the right, the coils will be thrown out ottheir position, the coil44 will be moved into a position more nearly atright angles and the coil 45 more nearly parallel with the lines otmagnetic force. greater amount ot current will, therefore, be caused toflow through the solenoid 1S and less through the solenoid 1S), movingthe solenoid 18 inward upon its arm 25a, the solenoid 19 out upon itsarm 2G, rocking the shaft correspondingly. rEllis rocking of the shaftwill then be communicated to the arm 23, which will be moved in the samedirection and the same amount as the arm 34, and thereby the record otthe arm 34 at the place at which the pressure gage is located will betransmitted to the distant arm Q8 and a corresponding record produced.

As l have said, it will, of course, be understood that the parts of mydevice, both at the pressure gage end and at the distant recording end,will be mounted in a suit-able casing with suitable supports ot anyprecrred kind. As the same, however, form no part of my invention andwill be readily understood, it'isbelieved that to illustrate them wouldonly encumber the drawings and specification with useless illustrationand description, and l have, therefore, not illustrated such parts.

That which l claim as my invention, and desire to secure by LettersPatent, is,-

1. The combination with a measuring instrument, having two branches inparallel, means including members operated by the movement of saidmeasuring instrument to cause Yrespective variation ot the impedance insaid branches ot said circuit, an indicating hand, and mechanismincluding coils connected respectively with said parallel circuits andoperated by the variations of the impedance in the respective branchesof said circuit to cause said indicating hand to move with the movementsot said measuring instrument.

2. ln combination, a measuring instrument, two electric circuitsconnected in parallel with each other in an alternating current circuit,means including mechanism operated by said measuring instrument to causerelative diderences in the impedance of said parallel circuits, an indexhand, mechanism including coils in operative relation with said twoparallel circuits and connected with said index hand and adapted by therelative variations .o the impedance in said circuits to cause movementso said index hand corresponding withthe movement ot said measuringinstrument.

, Bf'ln combination, a ment, two electric circuits connected in parallelwith each other in an alternating current circuit, meansincludingmembe'rs' operated by said measuring instrument to causevariations relative to each other of the impedance in said parallelcircuits, a pair of parallel circuits, cores for said solenoids, anindex hand, and connections between said solenoids and said index handadapted, when said solenoids are moved upon their cores, to move saidindex hand.

4. ln combination, a measuring instrument, a pair of solenoids connectedin parallel with each other to a source otalternating current, cores forsaid solenoids, connections between said solenoids and said measuringinstrument adal. ted by the movements of said measuring instrument tomove said solenoids to cover more or less of their respective cores, asecond .pair of solenoids, cores therefor, electric connections betweensaid first and second pair of solenoids whereby one of each pair is inseries with one ot the other pair, and the movements of said firstsolenoids upon their cores will cause corresponding movements of saidsecond solenoids upon their cores, an index hand, and connectionsbetween said index hand and said second solenoids whereby said index ofan alternating electric circuit measuring instrusolenoids connected onewith each ot said i hand may be said solenoids.

5. In combinati ment, alternating 5 cluding mechanis ment of said mearelative variatio said circuits,

Y 'coils on said 10- nating curre rocked by the movements of relativevariation of the current :How therein to cause a movement of said coilsupon said on, a measuring instrucores, and an indicating hand connectedwith current circuits, means insaid coils to move therewith with thelmovem operated by the movements of said measuring instrument. surininstrument to cause n of tlei'e electric current in JACOB W' BARDmechanism including cores, and Witnesses:

cores connected With said alteri A. P. COLVIN,

nt circuits and adapted by the g T. A. SCHLINK.

